PHEMU – 2014 Dec 24 – Europa (II) eclipsed Ganymede (III)

[Alex Pratt]

Provisional result of video photometry of this PHEMU event from Christmas Eve morning.

The minimum brightness of Ganymede occurred about 06:35:18 UTC.

A formal report will be submitted to the IMCCE in due course.

Clear skies,

     Alex.

 

Attachments:

1. 

   Phemu_II_ecl_III_20141224_061958_arpratt.jpg
   

[Bill Ward]

Hi,

That is pretty slick work Alex.

An excellent result!

cheers,

Bill.

[Jeremy Shears]

That’s an excellent result, Alex. Well done! Really nice “tight” photometry plots.

Go well!

Jeremy

[Alex Pratt]

Thanks Jeremy, Bill.

Every 6 years the Galilean satellites of Jupiter undergo a long series of mutual eclipses and occultations (partial, annular and total), thanks to the alignment of their orbital plane as viewed from Earth. These are known as PHEMUs (mutual phenomena).

Satellites of other gas giants can also encounter PHEMUs, although the Jovian ones are the most well-known.

The worldwide observing campaign is administered by the Institut de Mecanique Celeste et de Calcul des Ephemerides (IMCCE, Paris). By combining data from numerous observations the ephemerides of the Galilean satellites can be refined.

I won’t post all my results on the Forum – this was just a nice example.

Clear skies,

     Alex.

[Author]

Posts